Not when your adding 100 or so WHP. At thay rate, it is a whole new car!

 

I find it very hard to believe that you noticed a 30lb loss.

 

you can relocate the battery to the rear.. dicth the AC and power steering items if you want to regain the weight distribution.. or just adjust your suspension to deal with the slightly different weight distribution.. but unless you are seriously racing the car, the weight is not something that is of concern as the impact is minimal in nature

 

.........+1.....mind over matter, I guess

 

ok, sorry to pick on ya, but what does inertia have to do with the final drive? and air pressure and alignment and back spacing decides what part of the wheel it is going to see more stress.
finally i figured out what you were trying to say. larger wheels and tires have more weight towards the outside because of larger diameter. thus needing more force to turn them as compared to a smaller wheel. inertia has nothing to do with it. inertia is a constant force, and inertia will only come into play on braking. inertia is only being created on acceleration or constant movement. what you are talking about is torque, to get the larger dia. tires spinning.

 

only the people SERIOUSLY setting up a track car will notice ANY weight movement. this car needs to be pushed hard to get to the limit, and you will not find it on the street. sure you can slide it and stuff, but try doing a 100mph 4 wheel slide and steer with the throttle. to do this in the Z means hitting a 30-40mph turn with the best hopes you know the road.
if anyone can notice the difference with f/i, then they will know how to drive the car to make up for it. if you feel the difference, put another 1/2 degree of camber on the front suspension and it will all go away!

 

I see your points about how hp would offset any negative effects of skewing the weight distribution. But if you have a faster/more powerful car, you would certainly notice those things even more. I think the point is 70-100lbs is not enough to notice - however, if it were enough to notice, then you would certainly amplify the the negative effects of the skewed weight distribution with a more powerful car.

 

That's too hardcore. I just want a faster car that does not compromise street/comfort civility too much. At the same time, I do put a premium on handling dynamics, which is why I raised the issue in the first place.

 

In a straight line I could barely tell but once you hit a corner.....it could easily be felt.

 

well I did, just believe it. The car felt a little quicker with it's steering. 30 lbs up high like that is for sure noticable. It lowers the center of gravity, makes weight transfer faster etc. I even noticed there was a bigger gap between the front tires and body. 30 lbs is a lot. It's enough to gain .03 sec in the quarter mile which in itself isn't hugely noticable, but taking any weight up high from the front of the car really is noticable with it's handling. Who here can't tell the difference in traction when they take the spare tire out of the rear?


I'm talking about handling. Obviously the weight gain is negated by the power gain in a straight line

 

How about this...I have a full track 350Z and it is getting twin turboed right now. When it gets back, I will tell you if I felt the difference on the track...

 

I think when i got my APS ST it read 120lbs. So i think you TT guys gotta be closer to 150lbs.

 

hmm yeah, and you gotta fill up the intercooler with fluid.

the TT kit takes off the stock headers though, but in the end should still be 20 lbs? heavier than a ST setup. At least the weight is low for the most part. The intercooler being so far up front is gonna weigh the handling down a little, but not horrible or anything

 

Is the stock piece an "exhuast manifold" or a true equal-length header? Semantics only?

 

not sure i get what you're asking, the stock headers have really short runners. Not sure if they're truely equal length or not - assuming they are though.

 

halitosis - The Stock piece is a manifold not a header.

sentry65 - The difference between a manifold and a header is the length of the runners. Headers are equal length and manifolds are not.

 

ah ok, I didn't know there was a difference, that's cool. good to know

 

With the ST I couldn't really tell a difference. What I could tell a difference in was TRACTION.

 

take a poop you will run better times at the track!

 

Just for the record 'moment of inertia' is what I'm on about; like an ice skater spins faster with arms at side than with arms out
http://theory.uwinnipeg.ca/physics/rot/node5.html